This is an amazing illusion. I had to look for hours before I found the guitar, yet my wife found it instantly. I was sitting there concentrating trying to find it, I figured it was one of those pictures that you had to stare at and then the hidden object appears after your eyes go a little crossed. My wife came into the room and found it instantly and my friend said his wife also found the guitar instantly. My wife had to help me find it, she kept telling me to look lower, lower, lower...Ahhhhh... there it is, a guitar. What an odd phenomenon women can see the guitar instantly but men can't. Perhaps some day science will be able to explain. Will technology ever be that advance I wonder.